Waterproof portland cement and process of making same.



UNITED STATES PATENT OFFICE.

' SPENCER B. NEwBERnnoF SANDUSKY, fonio.

WATERPROOF PORTLAND CEMENT AND PROCESS OF MAKING SAME.

. Specification of Letters Patent.

Patented. A ril 23, 1907.

Application filed March 13,1905. Serial No. 249,786.

To all whom it may conceive:

Be it known that I, SPENoER B. NEW- BERRY, a citizen of the UnitedStates, residing at Sandusky, in the county of Erie and State of Ohio,have invented a certain new and useful Improvement in WaterproofPortland Cement and the Processes of Making the Same, of which thefollowing is a full,

' ste arate of lime, substantially free from glycerine or other solublesubstance.

. It also consists in theproduct of that process, namely, a cementrendered water proof by the mixture therewith of a small percentage ofan insoluble lime salt of one of the fatty acids, preferably stearate oflime.

hot, may

stearic acid. The resultant stearate of l me .The stearate of lime to beemployed may be made in any suitable manner. It may be -made by a dryprocess, to wit, by heating one part of stearioacid with two parts (moreor less) of dried slaked lime. Or it may be made by a wet process, towit, by adding the stearic acid to hot milk of lime. Specifically fiftypounds, more or less, of quick lime may be slaked in a hundred pounds,more or less, of water,

be added about thirtypounds of is to be dried so that it is in the formof a dry powder. The resultant of either method of operation, abovedescribed, is an insoluble stearate o f'lime, mixed with a greater orless excess of hydrate 'of lime, according to the quantity of limeemployed.

The stearate of lime may be-added to the cement clinker and groundtherewith: l-prefer, however, to add it to the finished dry cement.v Infact it is preferable to keep the cement and the stearate of limeseparated until a water proof cement is required for use. I have foundthat one or two per cent of stearate of lime added to the dry cement, isall and to this mixture, while it is still that is required to, renderthe mortar or concrete m ade therefrom absolutely and permanentlyimpervlous to water; and thisiis tlue even when cement is mixed with solarge a proportion of sand as five parts of sand to one of cement.

I am aware that various materials have been proposed, and to someextentused as the absorption of water. These various materials have beenproduced by saponifying, in various ways, various kinds of fats, oilsand waxes.

But all of said materials '60 additions to cement and plaster to preventheretofore proposed or used for this purpose have retained the glycerinewhich is set free by the saponification, and have, in fact, been softsoaps. .They are, therefore, in part, soluble in water, that is to saythe glycerine therein is soluble.v For .this reason cement or plaster,with which these materials are mixed, is not impervious to water andbecomes less so as the glycerine is dissolved by the water. The waterproofing material hereinbefore described is, however, free fromglycerine or any other material soluble in.

water, being a lime salt of a fatty acid, which acids are, as is knownto all chemists, formed from fats by breaking up the chemicalcombination of the glycerine with said fatty acids, and segregating themfrom the glycerine. The lime salt of a fat acid is absolutely insolublein waterpand the addition of this substance to cementor plaster in themanner and substantially the proportions heretofore described rendersthe resultant compound, when set, substantially and permanently waterproof.

I claim:

1.- The process of rendering cement water proof, which consists in mixintherewith a small percentage. of

or other soluble substance.

2. The process of rendering; cement water proof, whichconsists in mixingtherewith a small percentage of insoluble stearate of lime,

substantially free from glycerine or other soluble substance.

. 3. A composition of matter resulting from the described process, mentmixed with a small percentage of the insoluble lime salt of a fattyacid, substan-- the insoluble lime Salt of a fatty acid, substantiallyfree from glycerine which consists of ce-' tiall free from glycerine orother soluble In testimony whereof, I hereunto affix my substance.signature in the presence of two Witnesses.

4. A composition of matter which e0n- T T 7 sists of ((Illtllt mixedwith a small percentage SPEDOER PEWBEIRRX of insoluble stearate of limesubstantially Witnesses: free from glycerine or other soluble sub- HENRYJEAVONS,

stance. BERT MARTIN.

